Cover for road-manholes.



No. 814,013. PATENTED MAR. 6, 1906. P. BAUMANN.

COVER FOR ROAD MANHOLES. APPLICATION rILnn JULY 1, 1904.

4Z1 WIT/VESSES: MWEW T 0/1- UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

ratenteu March 6, 1906.

Application filed July 1, 1904. Serial Ho. 215,010-

the road metal having to be taken up or disturbed.

In manhole-covers of the ordinary construction, comprising a cover-framelocated with capability of vertical adg'ustment in a guide-frame, theinner wall 0 the latter is provided with stepped projections upon whichthe cover-frame, presenting similar steps, rests. When it is required toadjust the height of the cover-frame, the latter has to be turned.Since, however, the friction between the cover-frame and the well-rolledroad metal is considerable, such rotary motion is seriously impeded, sothat the metal must be broken up or loosened. According to my inventionI overcome this inconvenience by dispensing with steps on the uideframeand providin a ring inside the atter for the urpose o supporting thecoverframe. y rotating this supporting-ring the hei ht of thecover-frame can be adjusted without the road metal having to bedisturbed, since the cover-frame merely requires to be moved in adirection vertical to its axis.

My invention is shown in the accompanyin drawings, in which' igure 1 isa vertical section of a manhole with cover, the cover-ring being shownin its elevated position. Fig. 2 is a plan of Fig. 1, the cover with itsframe being removed. Fig. 3 is a view showing the inside of a portion ofthe covcrframe, which is here assumed to be opened out fiat, andlikewise a portion of the supporting-ring similarly extended.

The cover a may be of any ordinary construction and is carried by aframe I), resting on a ring d, located inside a frame e, which affordsguidance to the cover-frame b.

The inner wall of the frame I; is provided with steps b in well-knownmanner, while the ring (2' presents projections d, which in 006perationwith the steps I) enable the coverframe I) to be adjusted in height.

When owing to the road metal being worn down the cover a is to belowered, the frame I) should be slightly raised in any. suitable mannerin order to relieve the ring d from its lead. The ring (1 must now beturned into the desired position, whereupon the coverframe should begiven a few blows to cause it to descend. Its conical outer wallessentially facilitates the loosenin of any of the road metal which maybe adhering to it. A ti ht joint is effected between the frames 1) e ymeans of tarred rope c or like packing inserted in a groove in the lowerportion of the frame 6, whereby dirt is revented from getting access tothe shaft of the manhole.

In event of the road being remade the cover and its frame 65 can beelevated again into its highest position.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

A manhole-cover, comprising a lid, a frame carrying the same andprovided with steps on its inner wall, a uide-frame receiving thefirst-said frame, amv a ring located within the guide-frame andpresentlng supports upon which the said stepped frame rests,substantially as described.

In witness whereof I have hereunto signed my name, this 4th day of June,1904, in the presence of two subscribin witnesses.

FRI Z BAUMANN.

lvitnesses K. GELBERT, llIICHAEL ZIMMERMANN.

